What is the best remedy for a skin rash on the back of the neck and also on both arms. it gets very irritated with exposure to heat or the sun and when sweaty. and itches a lot when i shower under warm water. ?

Rash on neck,arms: Photosensitivity or skin reaction to Sun can be seen in the back of the neck and other exposed skin. Worsening of rash itch after a shower may be partly caused by protective skin oils being removed. Generalized body itching after a shower may be due to too thick red blood or lymphoma. After the shower and while the skin is wet, apply a moisturizing lotion like alphakeri. & Consult a dermatologist